Packaging

Abstract

To provide packaging that can stably protect the contents of cosmetics and other products over a long period of time, while contributing to the improvement of social sustainability. [Solution] A packaging body that seals and contains contents in a space surrounded by a laminated film 10, wherein the laminated film 10 comprises a sealant layer 11 disposed on the inside where the contents are contained, a gas barrier layer 12 disposed on the outside of the sealant layer 11, and a paper substrate layer 13 disposed on the outside of the gas barrier layer 12, wherein the sealant layer 11 contains a polyester resin, and when the materials constituting the laminated film 10 are classified into paper, plastic, metal, rubber, and other materials, the total mass of the paper contained in the laminated film 10 is greater than any of the total mass of the plastic, the total mass of the metal, the total mass of the rubber, and the total mass of the other materials.

Description

Technical Field

[0001] The present invention relates to a package that hermetically stores contents in a space surrounded by a laminated film.

Background Art

[0002] Conventionally, in cases where contents such as cosmetics, foods, and pharmaceuticals are packaged in small portions or simply packaged for refilling, a package called a pouch container has been widely used. Such a package has, for example, a form in which laminated films obtained by laminating a base material layer and a sealant layer are overlapped and the peripheral portion is sealed to form a space for hermetically storing contents inside.

[0003] On the other hand, in recent years, from the perspective of social sustainability, in various packages, it has been required to use so-called sustainable materials derived from recycled resources or biomass resources.

[0004] Therefore, in a package formed of a laminated film, in order to enhance social sustainability, it is important to develop a technique for configuring a part of the laminated film with a paper base material layer and increasing the proportion of the paper base material layer.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] [[ID= However, increasing the proportion of the paper substrate layer in the laminated film reduces thermal conductivity, making it difficult to adjust the sealing conditions of the sealant layer, thus lowering production efficiency. Furthermore, even when the sealant layer seals, the barrier properties of the sealed area are not sufficient, making it difficult to stably protect the contents over a long period of time.

[0007] The present invention aims to provide packaging that can stably protect the contents of cosmetics and the like over a long period of time, while contributing to the improvement of social sustainability. [Means for solving the problem]

[0008] The inventors of the present invention have discovered that by including a polyester resin in the sealant layer, the contents can be stably protected for a long period of time even when the proportion of the paper substrate layer is high, and have completed the present invention.

[0009] The following embodiments are specific means for solving the above problems.

[0010] <1> A packaging body that seals and contains contents within a space surrounded by laminated film, The laminated film is A sealant layer is disposed on the inside where the contents are contained, A gas barrier layer is disposed on the outside of the sealant layer, A paper substrate layer disposed on the outside of the gas barrier layer, Equipped with, The sealant layer contains a polyester resin, When the materials constituting the laminated film are classified into paper, plastic, metal, rubber, and other materials, A packaging in which the total mass of the paper contained in the laminated film is greater than the total mass of the plastic, the total mass of the metal, the total mass of the rubber, and the total mass of the other materials.

[0011] <2> The total mass of paper contained in the laminated film is 50% or more by mass, based on the total mass of the laminated film. <1> The packaging described above.

[0012] <3> The aforementioned polyester resin contains polyethylene terephthalate. <1> or <2> The packaging described above.

[0013] <4> The polyester resin contains polyethylene terephthalate, which contains ethylene glycol, terephthalic acid, and a third component other than ethylene glycol and terephthalic acid as monomer units. <1> ~ <3> The packaging described in any of the following.

[0014] <5> The polyester resin contains amorphous polyethylene terephthalate containing 10% by mass or more of the third component. <4> The packaging described above.

[0015] <6> The polyester resin contains crystalline polyethylene terephthalate containing less than 10% by mass of the third component. <4> or <5> The packaging described above.

[0016] <7> The polyester resin contains crystalline polyethylene terephthalate containing less than 5% by mass of the third component. <4> ~ <6> The packaging described in any of the following.

[0017] <8> The aforementioned polyester resin contains crystalline polyethylene terephthalate, which contains only ethylene glycol and terephthalic acid as monomer units. <1> ~ <7> The packaging described in any of the following.

[0018] <9> The gas barrier layer includes a metal foil layer or a plastic layer containing polyethylene terephthalate. <1> ~ <8> The packaging described in any of the following.

[0019] <10> The laminated film is arranged with the paper base material layer on the outermost side, and the package according to any one of <1> to <9>.

[0020] <11> The content contains at least one selected from the group consisting of retinol, retinol derivatives, ascorbic acid, ascorbic acid derivatives, and salts thereof, and the package according to any one of <1> to <10>.

Advantages of the Invention

[0021] According to the present invention, it is possible to provide a package that can stably protect the content such as cosmetics over a long period while improving the sustainability of society.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic diagram showing the package of the present invention. [Figure 2] It is a schematic diagram showing a cross section of the laminated film constituting the package of the present invention.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the package of the present invention will be described, but the present invention is not limited thereto. Also, the drawings may be schematically simplified for the purpose of explaining the content of the invention, and the drawn component or the dimensional ratio between components may not match the ratio of those dimensions described in the specification. Also, there are cases where the components described in the specification are omitted in the drawings or are drawn with the number omitted.

[0024] (Package) The package according to an embodiment of the present invention will be described with reference to FIG. 1. The packaging body 1 seals and contains the contents in a space 3 surrounded by laminated film 10. In the embodiment shown in Figure 1, the packaging body 1 has two rectangular laminated films 10 facing each other, and the peripheral edges 2 of the laminated films 10 are bonded together to form a space 3 for containing the contents.

[0025] Methods for sealing the contents into the packaging 1 include, for example, a method in which the peripheral edges 2 of two laminated films 10 are bonded together, leaving a portion untouched, the contents are placed into the space 3 through the remaining portion, and then the remaining portion is bonded together to complete the sealing; or a method in which the peripheral edges 2 of the two laminated films 10 are bonded together simultaneously with or after the contents are supplied between the two laminated films 10 to seal the contents into the space 3. It should be noted that the method for sealing the contents into the packaging 1 is not limited to these methods, and any method can be employed.

[0026] In the embodiment of the packaging 1 shown in Figure 1, two rectangular laminated films 10 of the same size are stacked on top of each other, and the peripheral edges 2 of the laminated films 10, that is, the parts corresponding to the four sides of the packaging 1, are bonded together. However, for example, one rectangular laminated film 10 can also be folded in the middle and stacked, and then the peripheral edges 2 of the laminated films 10, that is, the parts corresponding to the three sides of the packaging 1 excluding the folded portion, can be bonded together to form a space 3 for sealing and containing the contents.

[0027] Furthermore, the packaging body 1 is not limited to a pouch container of the form shown in Figure 1, but can take any form, such as a standing pouch type with a boat-shaped bottom that allows it to stand on its own, or a foldable bag shape such as a gusset type with gussets on the sides or bottom.

[0028] The packaging 1 may be provided with an easy-opening mechanism to facilitate the removal of its contents. Examples of such easy-opening mechanisms include a V-shaped notch that serves as the starting point for tearing the packaging 1, and a half-cut line formed by a cutter or laser processing that serves as the path for tearing the packaging 1.

[0029] (Laminated film) The laminated film 10 comprises a sealant layer 11 located on the inside where the contents are contained, a gas barrier layer 12 located outside the sealant layer 11, and a paper substrate layer 13 located outside the gas barrier layer 12 (Figure 2). An adhesive layer can be provided between the sealant layer 11 and the gas barrier layer 12, or between the gas barrier layer 12 and the paper substrate layer 13, for bonding the sealant layer 11 and the gas barrier layer 12, or the gas barrier layer 12 and the paper substrate layer 13. As the adhesive layer, for example, polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, or other laminating adhesives, or polyethylene, polypropylene, or other thermoplastic resins can be used. Furthermore, an intermediate layer, such as polyethylene terephthalate or nylon, may be provided between the sealant layer 11 and the gas barrier layer 12, taking into consideration the rigidity and tear resistance of the film. Furthermore, the paper substrate layer 13 may be protected by applying varnish to the surface opposite to the gas barrier layer 12, or by laminating a resin film or the like. In this invention, "film" refers to a very thin material with an extremely small thickness compared to its surface, and the film according to this invention also includes so-called "sheets." Films and sheets are usually distinguished by their thickness, with thin ones being called "films" and thicker ones being called "sheets."

[0030] When the materials constituting the laminated film 10 are classified into paper, plastic, metal, rubber, and other materials, the total mass of paper contained in the laminated film 10 is greater than the total mass of plastic, metal, rubber, and other materials. This makes it possible to improve the sustainability of society. Note that paper, plastic, metal, rubber, and other materials are classification names for materials, and it is not necessary to use all of these materials to construct the laminated film 10. In other words, depending on the embodiment of the laminated film 10, for example, it may not contain metal, rubber, or other materials. In this case, the total mass of the metal, the total mass of the rubber, and the total mass of the other materials are all 0.

[0031] (Sealant layer) The sealant layer 11 is primarily a heat-sealable layer. Therefore, the sealant layer 11 is made of a thermoplastic resin that can melt and fuse with each other when heated. The packaging body 1 according to the present invention can be formed by facing the sealant layers 11 of the laminated film 10 toward each other and welding and joining them by heat sealing.

[0032] The sealant layer 11 contains a polyester resin as the thermoplastic resin. Furthermore, considering the adhesive and gas barrier properties of the sealant layer 11, the polyester resin is preferably polyethylene terephthalate.

[0033] Polyester resins may contain polyethylene terephthalate as monomer units, which includes ethylene glycol, terephthalic acid, and a third component other than ethylene glycol and terephthalic acid.

[0034] The third component may include a diol component other than ethylene glycol or a dicarboxylic acid component other than terephthalic acid.

[0035] Examples of diol components other than ethylene glycol include 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, ethylene glycol, diethylene glycol, triethylene glycol, polyalkylene glycol, 1,1-cyclohexanedimethanol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 1,2-cyclohexanediol, and 1,4-cyclohexanediol.

[0036] Examples of dicarboxylic acid components other than terephthalic acid include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,5-frandicarboxylic acid, 2,4-frandicarboxylic acid, 3,4-frandicarboxylic acid, benzophenone dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 3,3'-diphenyldicarboxylic acid, and 4,4'-diphenyletherdicarboxylic acid; and aliphatic dicarboxylic acids such as cyclohexanedicarboxylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid.

[0037] To adjust the heat-sealability of the sealant layer 11, the polyester resin may contain any or a combination of amorphous polyethylene terephthalate containing 10% by mass or more of the third component, crystalline polyethylene terephthalate containing less than 10% by mass of the third component, and crystalline polyethylene terephthalate containing less than 5% by mass of the third component.

[0038] Furthermore, the polyester resin may contain crystalline polyethylene terephthalate, which consists only of ethylene glycol and terephthalic acid as monomer units and does not contain a third component.

[0039] The sealant layer 11 may contain thermoplastic resins other than polyester resins. For example, it may contain one or more of the following: low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ionomer resin, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene, or polyolefin resins modified with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, or other unsaturated carboxylic acids; polyvinyl acetate resin; or other resins.

[0040] The sealant layer 11 mainly consists of a thermoplastic resin containing a polyester resin, to which desired additives can be optionally added to prepare a resin composition, which can then be molded into a film or sheet using, for example, a T-die method, an inflation method, or other molding methods.

[0041] Examples of additives include those commonly used when forming films, such as antiblocking agents, lubricants, antistatic agents, flame retardants, and inorganic or organic fillers, which can be added as desired.

[0042] (Gas barrier layer) The gas barrier layer 12 blocks the entry of gases that can alter the contents, such as oxygen and water vapor, ensuring the contents are sealed and contained within the packaging 1, thereby extending the shelf life of the contents. The gas barrier layer 12 can be a metal foil layer made of aluminum, copper, zinc, gold, silver, or alloys thereof, or a plastic layer containing one or more of the following: polyethylene terephthalate, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, and aromatic polyamide. However, from the viewpoint of storage stability of the contents, it is preferable to include a metal foil layer or a plastic layer containing polyethylene terephthalate.

[0043] Furthermore, the gas barrier layer 12 may be formed by depositing a metal such as aluminum, or an inorganic compound such as alumina, onto a plastic film.

[0044] The above-mentioned plastic film can be made of, for example, polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; or polyamides such as nylon-6 and nylon-66. Among these, a plastic film made of polyethylene terephthalate is preferred.

[0045] (Paper base layer) To reduce the environmental impact and promote social sustainability, the total mass of paper contained in the laminated film 10 is greater than the total mass of other materials such as plastic, metal, rubber, and other materials. In particular, to achieve high sustainability, it is preferable that the total mass of the paper be 50% or more of the total mass of the laminated film 10. Here, "paper" refers to a material manufactured by intertwining and bonding plant fibers together. It is preferable that the paper substrate layer 13 be placed on the outermost surface of the laminated film 10.

[0046] The material for the paper base layer 13 is not particularly limited as long as it is a commonly used paper, but from the viewpoint of recyclability, it is preferable that it be paper mainly composed of plant-derived pulp, and more preferably paper mainly composed of wood pulp. Furthermore, as the wood pulp, it is preferable to use hardwood kraft pulp, softwood kraft pulp, etc.

[0047] Examples of paper include carbonless paper, release paper, bleached kraft paper, unbleached kraft paper, fine paper, cardboard, liner paper, coated paper, single-sided glossy bleached kraft paper, glassine paper, and graphite paper. Among these, carbonless paper, release paper, bleached kraft paper, unbleached kraft paper, fine paper, and single-sided glossy bleached kraft paper are preferred.

[0048] The paper substrate layer may have a pigment coating layer. The pigment coating layer may consist of one or more layers. The pigment coating layer preferably contains a pigment and a binder. Examples of pigments are not particularly limited, but include kaolin, talc, calcium carbonate, and plastic pigments. Examples of binders are not particularly limited, but include starch, styrene-acrylic copolymer latex, styrene-butadiene copolymer latex, and olefin-carboxylic acid emulsion copolymer latex.

[0049] Furthermore, to enhance adhesive strength, the paper substrate layer may be subjected to physical treatments such as corona treatment, plasma treatment, flame treatment, and ozone treatment, or chemical treatments such as anchor coating.

[0050] (Contents) The contents may contain at least one selected from the group consisting of retinol, retinol derivatives, ascorbic acid, ascorbic acid derivatives, and salts thereof. Retinol, retinol derivatives, ascorbic acid, ascorbic acid derivatives, and salts thereof all have the property of being altered by oxygen adsorption, which impairs their effectiveness as active ingredients.

[0051] Vitamin A compounds such as retinol are substances that exert various physiological effects, and are known, for example, as cosmetic ingredients that show wrinkle-improving effects. Commonly known retinol derivatives include retinyl palmitate, retinyl acetate, silussphere retinol, and tocopheryl retinoic acid.

[0052] Vitamin C derivatives such as ascorbic acid are substances that exert various physiological effects. For example, they have cellular respiration, enzyme activation, and collagen formation effects due to their strong reducing action, and they also have a melanin-reducing effect. Derivatives of ascorbic acid and their salts are not particularly limited and include, but are not limited to, alkali metal salts of ascorbic acid, earth metal salts of ascorbic acid, methyl or ethyl esters of ascorbic acid, isoascorbic acid, alkali metal salts of isoascorbic acid, earth metal salts of isoascorbic acid, and methyl or ethyl esters of isoascorbic acid. Ascorbic acid may be in L-form or D-form.

[0053] The properties of the contents are not particularly limited and may be, for example, liquids, creams, gels, solids, or mixtures thereof. Furthermore, the uses of the contents are not particularly limited and may include, for example, cosmetics, pharmaceuticals, food products, and beverages.

[0054] If the contents are liquid or similar, the contents can be impregnated into a nonwoven fabric or similar material and then placed in the space 3 of the packaging 1. One example of a product form in which the contents are impregnated into a nonwoven fabric is a cosmetic-impregnated mask, which is made by impregnating a sheet formed from a nonwoven fabric with cosmetic ingredients. The purpose of a cosmetic-impregnated mask is to ensure that the cosmetic ingredients come into contact with the user's face by covering the entire or a part of the face with the cosmetic-impregnated sheet for a certain period of time, thereby achieving a higher cosmetic effect.

[0055] The sheet used to impregnate the contents is not particularly limited, and any absorbent sheet conventionally used in the field of cosmetics can be used. Specifically, examples include nonwoven or woven fabrics made from polyester, rayon, polyolefin, cotton, silk, wool, or mixtures thereof. [Examples]

[0056] [Retinol quantitative test] Pouch containers were formed using various laminated films with different specifications. The contents containing retinol were impregnated into a nonwoven fabric, and this was sealed and placed in the pouch container to create a sample. The specifications of the laminated film shown in Table 1 indicate the composition of each layer, starting from the outermost layer of the packaging, with layer boundaries indicated by a slash ( / ). The numerical value displayed for each layer indicates the thickness (in μm). AL indicates an aluminum metal layer.

[0057] Comparative Examples 5 and 6 both involved wrapping 12 packets of the sample from Comparative Example 1 in a pouch pack using a transparent vapor-deposited film (product name "GX Film") manufactured by Toppan Printing Co., Ltd. Comparative Example 5 further included an oxygen absorber (product name "Vitalon" manufactured by Tokiwa Sangyo Co., Ltd.) inside the GX Film as the sample, while Comparative Example 6 did not include the oxygen absorber as the sample.

[0058] Each sample was left to stand at 50°C in an atmosphere with increased oxygen partial pressure. After 1 month (1M) to 3 months (3M), the retinol content was quantified, and the remaining percentage was calculated.

[0059] The evaluations shown in Table 1 are based on the following criteria: If the evaluation is A after 1 month (1M) and B or higher after 3 months (3M), the participant passes; otherwise, they fail. <Evaluation Criteria> A: Remaining amount is 90% or more B: Remaining amount is 80% or more but less than 90% C: Remaining amount is 60% or more but less than 80% D: Remaining amount is less than 60%

[0060] [Table 1]

[0061] As shown in Table 1, the results for Example 1 were confirmed to be favorable. Although the test results for Reference Example 1 were favorable, it does not have a paper substrate layer, and therefore cannot contribute to improving social sustainability, which is the objective of the present invention.

[0062] According to the packaging 1 of this embodiment described above, for example, the following effects can be achieved.

[0063] The packaging body 1 is configured to seal and contain contents in a space 3 surrounded by a laminated film 10, and the laminated film 10 comprises a sealant layer 11 located on the inside where the contents are contained, a gas barrier layer 12 located on the outside of the sealant layer 11, and a paper substrate layer 13 located on the outside of the gas barrier layer 12, wherein the sealant layer 11 contains a polyester resin, and when the materials constituting the laminated film 10 are classified into paper, plastic, metal, rubber, and other materials, the total mass of paper contained in the laminated film 10 is greater than the total mass of plastic, the total mass of metal, the total mass of rubber, and the total mass of other materials.

[0064] This makes it possible to provide packaging that excels in both social sustainability and the preservation stability of its contents.

[0065] By making the total mass of paper contained in the laminated film 10 50% or more of the total mass of the laminated film 10, the sustainability of society can be further enhanced.

[0066] By incorporating polyethylene terephthalate into the polyester resin contained in the sealant layer 11, the adhesion of the sealant layer 11 and the storage stability of the contents can be improved.

[0067] By incorporating polyethylene terephthalate, which contains ethylene glycol, terephthalic acid, and a third component other than ethylene glycol and terephthalic acid as monomer units, into the polyester resin, the adhesion of the sealant layer 11 and the storage stability of the contents can be further improved.

[0068] The polyester resin may contain any of the following: amorphous polyethylene terephthalate containing 10% or more of the third component by mass; crystalline polyethylene terephthalate containing less than 10% by mass of the third component; or crystalline polyethylene terephthalate containing less than 5% by mass of the third component; or a combination thereof. This allows for adjustment of the heat sealability of the laminated film 10.

[0069] Furthermore, the polyester resin may contain crystalline polyethylene terephthalate, which consists only of ethylene glycol and terephthalic acid as monomer units and does not contain a third component.

[0070] By configuring the gas barrier layer 12 to include a metal foil layer or a plastic layer containing polyethylene terephthalate, the storage stability of the contents can be improved.

[0071] In the laminated film 10, placing the paper substrate layer 13 on the outermost side makes it easier to enhance the sustainability of society.

[0072] The contents contain at least one selected from the group consisting of retinol, retinol derivatives, ascorbic acid, ascorbic acid derivatives, and salts thereof.

[0073] According to the packaging 1 of the present invention, contents containing active ingredients that deteriorate due to oxygen adsorption can be stored stably. [Explanation of Symbols]

[0074] 1 package 2 Peripheral area 3 space 10-layer film 11. Sealant layer 12 Gas barrier layer 13 Paper base layer

Claims

1. A packaging body that seals and contains contents within a space surrounded by laminated film, The laminated film is A sealant layer is disposed on the inside where the contents are contained, A gas barrier layer is disposed on the outside of the sealant layer, A paper substrate layer disposed on the outside of the gas barrier layer, Equipped with, The sealant layer contains a polyester resin, When the materials constituting the laminated film are classified into paper, plastic, metal, rubber, and other materials, A packaging in which the total mass of the paper contained in the laminated film is greater than the total mass of the plastic, the total mass of the metal, the total mass of the rubber, and the total mass of the other materials.

2. The packaging according to claim 1, wherein the total mass of paper contained in the laminated film is 50% by mass or more, based on the total mass of the laminated film.

3. The packaging according to claim 1, wherein the polyester resin contains polyethylene terephthalate.

4. The packaging according to claim 3, wherein the polyester resin contains polyethylene terephthalate, which contains ethylene glycol, terephthalic acid, and a third component other than ethylene glycol and terephthalic acid, as monomer units.

5. The packaging according to claim 4, wherein the polyester resin contains amorphous polyethylene terephthalate containing 10% by mass or more of the third component.

6. The packaging according to claim 4, wherein the polyester resin contains crystalline polyethylene terephthalate containing less than 10% by mass of the third component.

7. The packaging according to claim 4, wherein the polyester resin contains crystalline polyethylene terephthalate containing less than 5% by mass of the third component.

8. The packaging according to claim 3, wherein the polyester resin contains crystalline polyethylene terephthalate containing only ethylene glycol and terephthalic acid as monomer units.

9. The packaging according to claim 1, wherein the gas barrier layer includes a metal foil layer or a plastic layer containing polyethylene terephthalate.

10. The packaging according to claim 1, wherein the laminated film has the paper substrate layer on the outermost side.

11. The packaging according to any one of claims 1 to 10, wherein the contents contain at least one selected from the group consisting of retinol, retinol derivatives, ascorbic acid, ascorbic acid derivatives, and salts thereof.

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